Smoke-preventing furnace



2 Sheets-Sheet 1 (N0 Modgal.)

G. FARR & A. B. SEWARD. SMOKE PREVENTING FURNACE.

No. 317,935. Patented May 12, 1885.

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G. FARR 8a A. B. SEWARD.

SMOKE PREVENTING FURNACE.

Patented May 12, 1885.

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' UNITED STATES PATENT Orricn GEORGE FARR AND ALBERT B. SEiVARD, OFCINCINNATI, OHIO; SAID SEWARD ASSIGNOR TO EDlVAR-D \V. FARR, OF PEORTA,ILLINOIS.

SMOKE-PREVENTING FURNACE.

SPECIFICATION forming part of Letters Patent No. 317,935, dated May 12,1:885.

' Application filed November-13, ISRQ. (No model.)

T0 aZZ whom it may concern:

Be itknown that WB,GEORGE Finn and AI.- BERT B. SEWARD, both ofCincinnati, Hamilton county, and State of Ohio, have invented certainnew and useful Improvements in Smoke-Preventing Furnaces, of whichthefollowing is a specification,

Our invention is applicable to boiler and other stationary furnaces, orto locomotives; and its object is to prevent the formation of smoke byconsuming the smoke-forming gases before they escape from thefire-chamber. Referring to the drawings forming part of thisspecification, Figure l is a plan view of the fire-chamber, showing thepreferred form of our invention to be employed in connection with astationary-boiler furnace,the boiler and upper part of the walls beingremoved. Fig. 2 is a vertical transverse section through thefire-chamber shown in Fig. 1 at the dotted line :0 of the latter figure,the boiler and walls being present. Fig. 3 is a plan view of a furnace,showing a modification of our invention as illustrated by 1. Fig. 4 is atransverse Vertical section of the furnace shown in Fig. 3, and taken atthe dotted lines 3/ of the latter figure. Fig. 5 represents theapplication of our invention to a locomotive. Fig. 6 is an enlargeddetail view of one portion of our in vention.

A A are the side walls of the furnace, A the fire-chamber, A theash-pit, and A the boiler.

The fire-chamber is provided with the ordinary grate-bars, a, which maybe of any desired form.

In each of the side walls A, and somewhat above the grate-bars, is aflue, B,extendin g nearly the entire length of the fire-chamber. A flue,B,preferably vertical,communicates with this flue B and opens into theash-pit, as shown, and a short flue or opening, B", establishescommunication between this flue B and the outside air. Heated air fromthe ash-pit and cold air from the outside are thus mingled in the flue Bbefore entering the flue B. When preferred, air may be introduced fromthe ash-pit or the outside separately, as desired.

Several openings, b, establish communication between the flue B and thefire-chamber at either side, the number of these openings varying withthe length of the fire-chamber, in the present instance four of theseopenings being shown at either side ofthe fire-chamber.

These openings are preferably staggered, u

as shownthat is, the openings at one side of the chamber are oppositethe space between the openings at the opposite side.

, In the fines B, opposite each one of the openingsb,is placed ametallic box or conduit, 0, (preferably of cast iron,)the ends of whichare open toallow air to freely circulate in the flue B. In the side ofeach one of these boxes which is toward the opening I) is a conduitconnecting the interior of the box 0 with the opening I), and thisconduit is preferably constructed as follows: One end of a short tube,B, is connected to the box 0 near the center of the latter, and opensinto the cavity of said box. The other end of this tube extends part waythrough the opening Z toward the fireehamber.

At one side of the fines B, and preferably parallel thereto, are thepipes E, preferably located in the side walls, as shown in Figs. 1 and2, and communicating in any desired manner with the steam-space of theboiler. These pipes E are provided ,opposite each ofthe boxes 0, withjets or nipples a, each of which passes through the outer side of thebox G, the end extending aslight distanceinto the end of the tube D,which is within the box 0, as shown in Fig. 6, a space being leftbetween the outer side of the end of the nipple and of the inner surfaceof the tube, to permit air to pass through the tubes D from the boxes 0.The ends of these jets e discharge, preferably, in the same horizontalplane, so that the steam which passes through each jet will be carriedacross the fire-chamber in a plane above and parallel to the plane ofthe grate-bars.

The manner in which our invention as above described operates is asfollows: Fire having tubes D it causes a draft of air through the 100fiues B, B and B, and through the boxes 0 and tubes D, and thus the airis mingled with the steam coming from the jets a just before enteringthe firechamber. This combined steam and air is driven across thefurnace, the jets from the one side of the furnace alternating inposition with the jets from the opposite side, forming a complete sheetof steam and air above the fire-line, and the gas arising from theburning fuel is caught by this sheet of steam and air and driven towardthe sides of the chamber, in which positions it is consumed before thesmoke is fairly formed, the combustion taking place uniformly throughoutthe entire length of the fire-chamber.

The tendency of the smoke-consumers heretofore employed has been toconcentrate the heat at a certain limited point, and to compel all thesmoke to pass over this point, causing it to be here consumed. Theobjection to this is that too great heat is applied to the boiler at alimited point, and the boiler is thus very quickly burned out at thispoint.

The sheet of air and steam formed by 1h jets e of our invention compelan almost uniform distribution of the heated area throughout the entirechamber, said area being in a plane above and parallel to the fire-line,the point of the greatest heat, however, being at the sides of thechamber, and when the furnace is aboiler-furnace at the point ofgreatest dis tance between the grate-bars and the boiler, so that theheat is thus uniformly distributed to the boiler throughout the entireextent of the fire-chamber, thus not endangering the boiler.

When our invention is applied to a furnace at the time it islbuilt, thepipes E are preferably placed in the walls, as shown in Figs 1 and 2;but when applied to a furnace after it has been built these pipes may beplaced outside of the walls, as shown in Figs. 3 and 4., I

the boxes 0 being placed in the fines B within the Walls, as in theformer instance. in either event the operation of our invention will beprecisely the same.

If desired, the boxes 0 may be omitted, or rather modified in form, aplate, 0', being placed in front of that end of the openings Z) whichadjoins flue B, in which plate the short tubes D are secured, as in thesides of the boxes, the other features of the invention remaining thesame.

When applying our invention to locomotive-boiler furnaces, thearrangementshown in Fig. 5 will be substantially observed. In thisinstance both the pipes E and the boxes G are placed outside the wallsof the furnace, the boxes being supported by appropriate brackets orangle-irons, as cl, secured to the outside shell of the locomotive. Apipe or tube, F, passes through the water-leg G of the locomotive, whichtube serves the purpose of the openings 1), and into the outer end ofthis tube the ends of the short tubes D are illserted, as shown.

The principle and operation of our invention, whether used in connectionwith stationary or locomotive-boiler furnaces, is, as will be observed,precisely the same.

One end of each of the pipes E is provided with a cock, f, to enable thepipes to be blown out or cleaned.

\Vhen desired, the jets, flues, and pipes may be confined to one side ofthe furnace; but this mode of arrangement is not desirable, as the tionwith smoke-prevcnting devices to which.

they may be applicable.

Having thus described our invention, what we claim as new, and desire tosecure by'Letters Patent, is as follows:

1. The tlues B, located at the sides of the openings 1), communicatingwith the firechamber, in combination with the tubes D, extending intothe openings b, and the supportingplate O, and the steam-pipes E, havingjets 0 extending into the ends of tubes D, substantiall y as and for thepurposes specified.

2. The fines B, located at the sides of the fire-chamber and havinginlet-flues B B and openings 1), communicating with the fire'chamher, incombination with the boxes 0, located in the fines B, and provided withthe tubes D, extending into the openings 1), and the steampipes E,having jets 0 extending into the ends of the tubes D, substantially asand for the purposes specified.

GEORGE FARR. ALBERT B. SEWARD.

Attest:

E. R. HILL, A. S. LUDLow.

0 fire-chamber and having inlet-flues B B and

